I have a 1978 Chevy K10 not shifting into 3rd gear 350 motor 300 tranny

Asked by Feb 28, 2017 at 10:34 AM about the 1978 Chevrolet C/K 10 Custom

Question type: General

Drive truck for 3 weeks ran fine transmission will
go into 3rd sometimes sometimes it won't. I  
replace the vacuum assist and transmission flush
filter new fluids

4 Answers

74,715

Time for it to be rebuilt. Could have prolonged it but since you did a flush on it, your going to have nothing but problems with it.

Has anyone used seafoam transmission treatment

Can the kick down cable keep from going into 3rd

74,715

That is something to check out. Maybe it is tight.

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